// Daniel Shiffman

// http://natureofcode.com

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// Example 1-3: Vector subtraction

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function setup() {

  createCanvas(640,360);

}

​

function draw() {

  background(51);

​

  let mouse = createVector(mouseX,mouseY);

  let center = createVector(width/2,height/2);

  mouse.sub(center);

​

  translate(width/2,height/2);

  strokeWeight(2);

  stroke(255);

  line(0,0,mouse.x,mouse.y);

}